<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <!-- <script src="手写promise.js"></script> -->
  <script src="手写promise.all.js"></script>
  <!-- <script src="手写promise.race.js"></script> -->
  <!-- <script src="红绿灯交替重复亮.js"></script> -->
</body>
</html>